. . . . . . . . . "Player safety in American football has been a major controversial subject over the years, with the main concern being concussions, a type of traumatic brain injury that have been purported to be one of the influences for player suicides and other symptoms after retirement including memory loss and depression. In 2007, the National Football League conducted a study consisting of more than 2,500 retired NFL players, which revealed that the players who have had at least three concussions during their playing careers would have tripled the risk of depression. Five years after the NFL's study, the Canadian Football League conducted a study with six CFL players, and later found chronic traumatic encephalopathy (CTE) in three of the players. In 2012, a study revealed players have triple the risk of having neurodegenerative diseases than the general population. While there have been efforts made to try to decrease the number of head injuries, according to Dr. Kevin M. Guskiewicz, there are about 300,000 sports related concussions every single year. Also, after sampling 4251 football players, of those who suffered from a concussions, 6.5% suffered another concussion during the same exact season. According to another study done by University of North Carolina showed that 31% of concussed athletes rushed immediately back onto the field after injury. This is showing that far too many times, players are being rushed back to the field too quickly."@en . . . . . . . "Concussions in American football"@en . . "Player safety in American football has been a major controversial subject over the years, with the main concern being concussions, a type of traumatic brain injury that have been purported to be one of the influences for player suicides and other symptoms after retirement including memory loss and depression. In 2007, the National Football League conducted a study consisting of more than 2,500 retired NFL players, which revealed that the players who have had at least three concussions during their playing careers would have tripled the risk of depression. Five years after the NFL's study, the Canadian Football League conducted a study with six CFL players, and later found chronic traumatic encephalopathy (CTE) in three of the players. In 2012, a study revealed players have triple the risk "@en .